This is the entire Jōyō Kanji, as well as all Kana, and it was a pain in the arse to scrape and sort. The Kanji is sorted into a totally 100% legit "frequency of use" distribution, which intuitively to me, seems like a great way to learn them.
Grind a set until you stop making miskates, then add another set. You can switch to review mode whenever you would like to retry anything you failed.
This doesn't replace writing practice, you still have to do that, do not skip writing practice.
You can either answer Kanji in its direct translation, the Onyomi reading, or the Kunyomi reading.
An extra challenge once you're confident in your ability to read.
Some Kanji is also supported.